Improvement in ore-stamps



s. KENDALL.

Ore-Stamp.

, Patented Nov. 12 1s7s.-

witfiesse 154.

".PEIERs, PNOTO-LITHQGBAPNEN. WASHINGTON. B, C.

STEPHEN KENDALL, OF JACKSON, CALIFORNIA, ASSIGNOR OF ONE-HALF I FFIGE.

HIS RIGHT TO JOHN A. EAGON- ANDT. J. PHELPS.

IM PROVEM ENT IN ORE-STAM PS.

Specification forming part of Letters Patent No. 209,896, dated November12, 1878; application filed July 8, 1878.

To all whom it may concern."

Be it known that I, STEPHEN KENDALL, of Jackson, county of Amador andState of California, have invented an Improved Quartz- Mill; and I dohereby declare the following to be a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings.

My-invention relates to an improvement in mills for crushing andgrinding quartz; and myimprovement consists in providing the guide ofthe stamp-rod with a curved projection having a concentric curved slot,provided with a rubber cushion for holding the cam on which the tappeton the stamp-rod acts.

Figure 1 is a view of my mill, showing a battery and mortar having asingle stamp. Fig. 2 is a section.

Let A represent a mortar, which in the present case is constructed insuch a manner as to accommodate one stamp only, and having one or moredischarge-openings, in which are the screens B. The upper portion of themortar is curved inward, as shown, and in the rear upper portion isformed the feedhole 0, through which the ore is fed to the mortar.

Attached to or formed on the sides of the mortar are the sockets D, intowhich are stepped the lower ends of the vertical frameposts E, which areheld in place by the straps or bands F, secured by bolts, as shown. Atimber across the top joins these frame-posts together, so that all theframe-work necessary to guide the stamp-stem and support it is attachedto the mortar.

The stamp, shoe, and die are the same as in any ordinary battery.

Between thevertical timbers E and above the mortar is placed a guide orgirt, G, which is of cast-iron, and through which the stampstem plays.On one side of this girt is formed a curved projection, H, which has acurved slot, I, formed in its upper surface, as shown. In this curvedslot rests a horizontally-placed removable incline or cam, J. This camhas its lower end made on a horizontal plane, so that it will rest inthe bottom of the slot I in the projection H. In the bottom of thisslot, or in the bottom of the cam,'is a rubber block or bed, K, whichforms a cushion for the cam, so that, when the tappet strikes it inrapid revolution, no jar will be experienced. A spring may be usedinstead of the rubber, if desired.

Upon the stamp-stein L, at the proper point above the girt, with its camor incline, is secured a tappet, having a beveled flange or cam-likeprojection N, on its lower edge. When the stamp-stem isrotated, ashereinafter described, this beveled flange engages with the cam, and, bymoving up the incline, raises the stamp. As soon as the highest point inthe cam is reached the flange on the tappet leaves the cam and the stampdrops, which operation is repeated as the stamp-stem is revolved.

In order to allow the vertical motion to the stamp-stem necessary inthis device, and at the same time admit of its rotary motion, the upperpart of the stamp-stem, as shown at O, is made square, or has a featherformed on it. In the presentinstance I have shown it as square in shape,and passing through acollar, P, journaled in the upper cross-timber, asshown. Attached to this collar 1? is the horizontal pulley Q, throughwhich the square or feathered end of the stem also passes, the holethrough the collar and center of the pulley being formed to correspondwith the shape of I the stem. As the pulley is revolved by the belt thestamp-stem and'stamp and shoe will be revolved, and at the same time avertical motion of the stamp-stem is possible, so as to admit of theflange on the tappet rising up the incline of the cam on thegirt-timbers, and raising the stamp.

By the method employed of placing a rubber band or spring under thetappet. a great deal of the jar is avoided, which it has been impossibleto overcome by the old method.

The grinding action of the stamp is very advantageous in crushing thequartz, since, as soon as the blow is struck and the quartz crushedunder the stamp, it is immediately ground finer, and any particles ofgold under the stamp are brightened or polished, so as to put them inproper condition for perfect amalgam ation.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The girt G, having the curved slot I to receive the elastic cushion K,in combination with the curved encircling-cam J, tappet N, and stampstemL, substantially as and for the purpose herein described.

In witness whereof I hereunto set my hand and seal.

STEPHEN KENDALL. [L.

Witnesses:

FRANK A. BRooKs, CHAS. G. YALE.

